Unvented hot water pressure build-up problem

[Steve Firth]

Liar, Cheat, Fraud.

[Doctor Drivel]

This plantpot must be fascinating for a shrink.

[Doctor Drivel]

This plantpot is avery sad case indeed.

[Dave Plowman (News)]

Nice of you to quote only your own posts in a reply. Highlights the appalling grammar and spelling.

[Doctor Drivel]

Another plantpot appears.

[Steve Firth]

Liar, Cheat, Fraud.

[Steve Firth]

Liar, Cheat, Fraud.

[Doctor Drivel]

A sad case. A very sad case. I now believe everything I read on that current thread ion him. Very sad.

[Doctor Drivel]

They could have a whole conference on this plantpot.

[Steve Firth]

obsessive disorder

Liar, Cheat, Fraud.

[Steve Firth]

message

Liar, Cheat, Fraud.

[Doctor Drivel]

I wonder what the official name is for this plantpots condition.

[Doctor Drivel]

[Steve Firth]

obsessive disorder

[Steve Firth]

message

[The Natural Philosopher]

obsessive disorder

Plonk

Thats both of you now.

[Steve Firth]

Then you won't see me poking my tongue at you.

[Winelight]

In the end, owing to lack of space to do anything more ambitious, I have fitted a NRV to the hot water feed from the cylinder. At least this goes some way to stopping the higher pressure mains building up the pressure in the cylinder.

I will fit a PRV in the cold feed to the shower as/when I can get access to the appropriate pipe (there's not really any chance of connecting to the balanced cold feed output from the cylinder PRV). In the longer term I might replace the unvented system with a thermal store (with internal heat exchanger, owing to lack of space).

Thanks for all the advice.

Andrew